Configuring ATM

Configuring ATM

This chapter describes how to configure ATM on the Cisco ASR 920 Series Aggregation Services Routers. Effective Cisco IOS-XE Release 3.18, Clear Channel ATM is supported on Cisco ASR-920-24SZ-IM and Cisco ASR-920-12SZ-IM Aggregation Services Router.

Information About Configuring ATM Interface

ATM Interface

Asynchronous Transfer Mode (ATM) uses one Virtual Circuit (VC) to carry all traffic to the next hop address. Even with VC multiplexing, a single VC carries all traffic of the same protocol to the next hop address. Though Weighted Random Early Discard (Per-VC (D)WRED) and WFQ can classify and prioritize the packets, they all share one single Quality of Service (QoS) VC.

Restrictions for Clear Channel ATM

  • Operation, Administration, and Maintenance (OAM) is not supported.

  • Access Circuit Redundancy (ACR) is not supported.

  • Automatic Protection Switching (APS) is not supported.

  • Optical Carrier level 12 (OC-12) mode is not supported.

  • Clear Channel ATM is not supported for layer 3 on the routers.

Information About Clear Channel ATM

When the clear channel ATM feature is enabled, the entire payload rate over Synchronous Optical Network (SONET) or the Synchronous Digital Hierarchy (SDH) line is used as a single flow of cells or packets. An STS-3c/VC4 container is used to represent the OC-3/STM-1 concatenation types (OC-3 clear channels). Up to four OC-3/STM-1 are supported.

Clear channel ATM supports the following Layer 1 features:

  • Framing configuration between SONET and SDH

  • Local (diagnostic) and line (network) loopback

  • Alarm detection and reporting capabilities

  • System, local and line timing options

Effective Cisco IOS-XE Release 3.18, Clear Channel ATM on OC-3/STM-1 is supported on Cisco ASR-920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Aggregation Services Router .

Clear channel ATM Pseudowire supports the following Layer 2 features:

  • Permanent Virtual Path (PVP)

    For configuration examples, see the "Configuring Pseudowire, Time Division Multiplexing Configuration Guide" chapter.

  • QoS experimental bits (Exp) marking on ATM Layer 2 interfaces

    For configuration examples, see the "Configuring Pseudowire, Time Division Multiplexing Configuration Guide chapter.

How to Configure ATM

This section explains how to configure ATM on T1, E1, OC-3, and OC-12 interfaces.

Configuring ATM on a T1 or E1 Controller

To configure ATM on a T1 or E1 controller, follow these steps:

Procedure

  Command or Action Purpose

Step 1

configure terminal

Example:

Router# configure terminal

Enters the global configuration mode.

Step 2

card type {t1 | e1} slot subslot

Example:

Router(config)# card type t1 0 1

Specifies the slot and subslot number of the T1 or E1 interface.

Step 3

controller t1 slot/ subslot/ port

Example:

Router(config)# controller t1 0/1/0

Enters controller configuration mode to configure the T1 interface.

Step 4

framing esf

Example:

Router(config-controller)# framing esf

Selects the framing type as Extended Super Frame.

Step 5

linecode b8zs

Example:

Router(config-controller)# linecode b8zs

Selects the linecode type as binary 8-zero substitution (B8ZS).

Step 6

cablelength long db-loss-value

Example:

Router(config-controller)# cablelength long 0db

Number of decibels by which the transmit signal is decreased.

Step 7

atm

Example:

Router(config-controller)# atm

Configures the interface for ATM.

Step 8

exit

Example:

Router(config-controller)# exit

Enters global configuration mode.

Step 9

interface atm slot/ subslot/ port

Example:

Router(config)# interface ATM 0/1/0

Specifies the ATM interface.

Step 10

no ip address

Example:

Router(config-if)# no ip address

Removes the interface IP address.

Step 11

no atm enable-ilmi-trap

Example:

Router(config-if)# atm enable-ilmi-trap

Disables Integrated Local Management Interface traps.

Step 12

interface atm slot/ subslot/ port.subinterface point-to-point

Example:

Router(config)# interface atm 0/1/1.1 point-to-point

Enters subinterface configuration mode and creates a point-to-point subinterface.

Step 13

pvc vpi/ vci l2transport

Example:

Router(config-subif)# pvc 10/100 l2transport

Assigns a VPI and virtual channel identifier (VCI).

Step 14

encapsulation aal5

Example:

(cfg-if-atm-l2trans-pvc)# encapsulation aal5

Sets the encapsulation type as aal5.

Step 15

xconnect peer-router-id vcid encapsulation mpls

Example:

Router(cfg-if-atm-l2trans-pvc)# xconnect 10.1.2.3 1 encapsulation mpls

Binds the attachment circuit to a pseudowire VC.

Configuring ATM on OC-3 IM with SDH Framing

To configure ATM on OC-3 interface module with SDH framing, perform these steps:

Procedure

  Command or Action Purpose

Step 1

configure terminal

Example:

Router# configure terminal

Enters the global configuration mode.

Step 2

controller sonet slot/ subslot/ port

Example:

Router(config)#controller sonet 0/1/0

Enters controller configuration mode to configure SDH.

Step 3

framing sdh

Example:

Router(config-controller)#framing sdh

Specifies the framing type as SDH.

Step 4

aug mapping au-4

Example:

Router(config-controller)#aug mapping au-4

Configures the AUG to be derived from AU-4.

Step 5

au-4 au-4-number tug-3 tug-3-number

Example:

Router(config-controller)#au-4 1 tug-3 1

Specifies the Administrative Unit type 4 (AU-4) and Tributary Unit group type 3 (TUG-3) numbers.

Step 6

tug-2 tug-2-number e1 e1-line-number atm

Example:

Router(config-ctrlr-tug3)# tug-2 1 e1 1 atm

Creates an ATM group for the AU-4.

Step 7

interface ATM slot/ subslot/ port.au-4/ tug-3/ tug-2/ e1. subint point-to-point

Example:

Router(config)# interface ATM 0/1/0.1/1/1/1.1 point-to-point

Specifies the ATM interface as the point-to-point interface type.

Step 8

pvc vpi/ vci l2transport

Example:

Router(config-subif)#pvc 10/100 l2transport

Assigns a VPI and virtual channel identifier (VCI).

Step 9

encapsulation aal5

Example:

Router(cfg-if-atm-vc)#encapsulation aal5

Sets the PVC encapsulation type to AAL5.

Step 10

xconnect remote-ip-address vc-id encapsulation mpls

Example:

Router(cfg-if-atm-vc)#xconnect 10.1.1.101 100 encapsulation mpls

Binds the attachment circuit to the ATM interface to create a pseudowire.

Configuring ATM on OC-3 IM with SONET Framing

To configure ATM on OC-3 interface module with SONET framing, perform these steps:

Procedure

  Command or Action Purpose

Step 1

configure terminal

Example:

Router# configure terminal

Enters the global configuration mode.

Step 2

controller sonet slot/ subslot/ port

Example:

Router(config)#controller sonet 0/1/0

Enters controller configuration mode to configure SONET.

Step 3

framing sonet

Example:

Router(config-controller)# framing sonet

Specifies the framing type as SONET.

Step 4

sts-1 { 1 - 12 | 1 - 3 | 4 - 6 | 7 - 9 | 10 - 12}

Example:

Router(config-controller)# sts-1 1
Configures the Synchronous Transport Signal (STS) (level)-1 in the SONET hierarchy. For OC-3 interfaces, this value is 1.
Note 
The 1-12 value is supported only in OC-12 mode.

Step 5

vtg vtg_number t1 t1_line_number atm

Example:

Router(config-ctrlr-sts)# vtg 1 t1 1 atm

Configures the T1 on the VTG . For SONET framing, values are 1 to 7

Step 6

interface ATM slot/ subslot/ port.sts-1/ vtg/ t1. subint. point-to-point

Example:

Router(config)# interface ATM 0/1/0.1/1/1.1 point-to-point

Specifies the ATM interface as the point-to-point interface type.

Step 7

pvc vpi/ vci l2transport

Example:

Router(config-subif)#pvc 10/100 l2transport

Assigns a VPI and virtual channel identifier (VCI).

Step 8

encapsulation aal5

Example:

Router(cfg-if-atm-vc)#encapsulation aal5

Sets the PVC encapsulation type to AAL5.

Step 9

xconnect remote-ip-address vc-id encapsulation mpls

Example:

Router(cfg-if-atm-vc)#xconnect 10.1.1.101 100 encapsulation mpls

Binds the attachment circuit to the ATM interface to create a pseudowire.

Configuring the ATM Interface on OC-3 IM

This section describes how to configure an ATM interface.

Perform the following task to enable the ATM interface:

Procedure

  Command or Action Purpose

Step 1

configure terminal

Enters global configuration mode from the terminal.

Step 2

interface atm slot/ subslot/ port.subport

Example:

interface atm 0/ 5/ 0.1/1/1.1

Specifies the ATM interface using the appropriate format of the interface atm command.

Step 3

no shutdown

Changes the shutdown state to up and enables the ATM interface, thereby beginning the segmentation and reassembly (SAR) operation on the interface.

  • The no shutdown command passes an enable command to the ATM interface, which then begins segmentation and reassembly (SAR) operations. It also causes the ATM interface to configure itself based on the previous configuration commands sent.

Configuring ATM Interface on TDM IMs

To configure ATM interface on TDM IMs, follow these steps:

Procedure

  Command or Action Purpose

Step 1

configure terminal

Example:

Router# configure terminal

Enters the global configuration mode.

Step 2

card type {t1 | e1} slot subslot

Example:

Router(config)# card type t1 0 1

Specifies the slot and subslot number of the T1 or E1 interface.

Step 3

controller t1 slot/ subslot/ port

Example:

Router(config)# controller t1 0/1/0

Enters controller configuration mode to configure the T1 interface.

Step 4

atm

Example:

Router(config-controller)# atm

Configures the interface for ATM.

Step 5

exit

Example:

Router(config-controller)# exit

Enters global configuration mode.

Step 6

interface atm slot/ subslot/ port.subinterface point-to-point

Example:

Router(config)# interface atm 0/1/1.1 point-to-point

Enters subinterface configuration mode and creates a point-to-point subinterface.

Step 7

pvc vpi/ vci l2transport

Example:

Router(config-subif)# pvc 10/100 l2transport

Assigns a VPI and virtual channel identifier (VCI).

Step 8

encapsulation aal5

Example:

(cfg-if-atm-l2trans-pvc)# encapsulation aal5

Sets the encapsulation type as aal5.

Step 9

xconnect peer-router-id vcid encapsulation mpls

Example:

Router(cfg-if-atm-l2trans-pvc)# xconnect 10.1.2.3 1 encapsulation mpls

Binds the attachment circuit to a pseudowire VC.

Configuring PVCs

To use a permanent virtual circuit (PVC), you must configure the PVC into both the router and the ATM switch. PVCs remain active until the circuit is removed from either configuration.

When a PVC is configured, all the configuration options are passed on to the ATM interface. These PVCs are writable into the nonvolatile RAM (NVRAM) as part of the Route Processor (RP) configuration and are used when the RP image is reloaded.

Some ATM switches might have point-to-multipoint PVCs that do the equivalent of broadcasting. If a point-to-multipoint PVC exists, then that PVC can be used as the sole broadcast PVC for all multicast requests.

To configure a PVC, perform the tasks in the following sections.

Creating a Permanent Virtual Circuit

To use a permanent virtual circuit (PVC), configure the PVC in both the router and the ATM switch. PVCs remain active until the circuit is removed from either configuration. To create a PVC on the ATM interface and enter interface ATM VC configuration mode, perform the following procedure beginning in global configuration mode:

Procedure
  Command or Action Purpose

Step 1

Device(config)# interface atm slot / subslot / port [. subinterface-number {multipoint | point-to-point }]

Enters subinterface configuration mode for the specified port on the ATM Interface Module (IM), where:

  • slot—Specifies the chassis slot number in the Cisco ASR 920 Series Router where the SIP is installed.

  • subslot—Specifies the secondary slot of the SIP where the IM is installed.

  • port—Specifies the number of the individual interface port on an IM.

  • subinterface—Specifies the number of the subinterface.

Step 2

Device(config-if)# atm tx-latency milliseconds

(Optional) Configures the default transmit latency for VCs on this ATM IM interface. The valid range for milliseconds is from 1 to 200, with a default of 100 milliseconds.

Step 3

Device(config-if)# pvc [name ] vpi /vci

Configures a new ATM PVC by assigning its VPI/VCI numbers and enters ATM VC configuration mode. The valid values for vpi /vci are:

  • name—(Optional) An arbitrary string that identifies this PVC.

  • vpi—Specifies the VPI ID. The valid range is 0 to 255.

  • vci—Specifies the VCI ID. The valid range is 32 to 65535. Values 1 to 31 are reserved and should not be used, except for 5 for the QSAAL PVC and 16 for the ILMI PVC. ILMI is not supported on the Cisco ASR 920 Series Routers.

Note 

When using the pvc command, remember that the vpi /vci combination forms a unique identifier for the interface and all of its subinterfaces. If you specify a vpi /vci combination that has been used on another subinterface, the Cisco IOS software assumes that you want to modify that PVC’s configuration and automatically switches to its parent subinterface.

Step 4

Device(config-if-atm-vc)# protocol protocol {protocol-address | inarp } [[no ] broadcast ]

Example:

Configures the PVC for a particular protocol and maps it to a specific protocol-address

.

  • protocol—Typically set to ip or pppoe , but other values are possible.

Note 

PPP is not supported on the Cisco ASR 920 Series Routers.

  • protocol-address—Destination address or virtual interface template for this PVC (if appropriate for the protocol ).

  • inarp —Specifies that the PVC uses Inverse ARP to determine its address.

  • [no ] broadcast —(Optional) Specifies that this mapping should (or should not) be used for broadcast packets.

Step 5

Device(config-if-atm-vc)# inarp minutes

(Optional) If using Inverse ARP, configures how often the PVC transmits Inverse ARP requests to confirm its address mapping. The valid range is 1 to 60 minutes, with a default of 15 minutes.

Step 6

Device(config-if-atm-vc)# encapsulation {aal0 |aal5 |aal5snap }

(Optional) Configures the ATM adaptation layer (AAL) and encapsulation type.

Step 7

Device(config-if-atm-vc)# tx-limit buffers

(Optional) Specifies the number of transmit buffers for this VC. The valid range is from 1 to 57343, with a default value that is based on the current VC line rate and on the latency value that is configured with the atmtx-latency command.

Note 

Repeat Step 4 through Step 7 for each PVC to be configured on this interface.

Step 8

Device(config-if-atm-vc)# end

Exits ATM VC configuration mode and returns to privileged EXEC mode.

Verifying a Multipoint PVC Configuration

To verify the configuration of a particular PVC, use the show atm pvc command: 


Device# show atm pvc 1/120
 
ATM3/1/0.120: VCD: 1, VPI: 1, VCI: 120 
UBR, PeakRate: 149760
AAL5-LLC/SNAP, etype:0x0, Flags: 0xC20, VCmode: 0x0
OAM frequency: 0 second(s), OAM retry frequency: 1 second(s)
OAM up retry count: 3, OAM down retry count: 5
OAM Loopback status: OAM Disabled
OAM VC status: Not Managed
ILMI VC status: Not Managed
InARP frequency: 15 minutes(s)
Transmit priority 3
InPkts: 1394964, OutPkts: 1395069, InBytes: 1833119, OutBytes: 1838799 
InPRoc: 1, OutPRoc: 1, Broadcasts: 0
InFast: 0, OutFast: 0, InAS: 94964, OutAS: 95062 
InPktDrops: 0,  OutPktDrops: 0 
CrcErrors: 0, SarTimeOuts: 0, OverSizedSDUs: 0, LengthViolation: 0, CPIErrors: 0
Out CLP=1 Pkts: 0
OAM cells received: 0
F5 InEndloop: 0, F5 InSegloop: 0, F5 InAIS: 0, F5 InRDI: 0
F4 InEndloop: 0, F4 InSegloop: 0, F4 InAIS: 0, F4 InRDI: 0
OAM cells sent: 0
F5 OutEndloop: 0, F5 OutSegloop: 0, F5 OutRDI: 0
F4 OutEndloop: 0, F4 OutSegloop: 0, F4 OutRDI: 0
OAM cell drops: 0
Status: UP

Note

To verify the configuration and current status of all PVCs on a particular interface, you can also use the show atm vc interface command.

Mapping a Protocol Address to a PVC

The ATM interface supports a static mapping scheme that identifies the network address of remote hosts or routers. This section describes how to map a PVC to an address, which is a required task for configuring a PVC.


Note

If you enable or disable broadcasting directly on a PVC using the protocol command, this configuration will take precedence over any direct configuration using the broadcast command.

See examples of PVC configurations in the section "ATM Configuration Examples".

To map a protocol address to a PVC, use the following command in interface-ATM-VC configuration mode:

Command

Purpose 


Router(config-if-atm-vc)# protocol  protocol protocol-address  [[no ] broadcast ]

Maps a protocol address to a PVC.

Configuring the AAL and Encapsulation Type

To configure the ATM adaptation layer (AAL) and encapsulation type, use the following command beginning in interface-ATM-VC configuration mode:

Command

Purpose 


Router(config-if-atm-vc)# encapsulation aal5  encap

Configures the ATM adaptation layer (AAL) and encapsulation type.

  • For a list of AAL types and encapsulations supported for the aal-encap argument, refer to the encapsulation aal5 command in the "ATM Commands" chapter of the Cisco IOS Wide-Area Networking Command Reference . The global default is AAL5 with SNAP encapsulation.

Configuring PVC Traffic Parameters

The supported traffic parameters are part of the following service categories: Constant Bit Rate (CBR), Unspecified Bit Rate (UBR), Variable Bit Rate Non Real-Time (VBR-NRT), and real-time Variable Bit Rate (VBR). Only one of these categories can be specified per PVC connection so if a new one is entered, it will replace the existing one.

The -pcr and -mcr arguments are the peak cell rate and minimum cell rate, respectively. The -scr and -mbs arguments are the sustainable cell rate and maximum burst size, respectively.

For a description of how to configure traffic parameters in a VC class and apply the VC class to an ATM interface or subinterface, refer to the section Configuring VC Classes .

To configure PVC traffic parameters, use one of the following commands beginning in interface-ATM-VC configuration mode:

Command

Purpose 


Router(config-if-atm-vc)# cbr   peak_cell_rate_KBPS

Configures the Constant Bit Rate (CBR). 


Router(config-if-atm-vc)# ubr  output-pcr

Configures the Unspecified Bit Rate (UBR). 


Router(config-if-atm-vc)# vbr-nrt  output-pcr output-scr output-mbs

Configures the Variable Bit Rate-Non Real Time (VBR-NRT) QOS. 


Router(config-if-atm-vc)# vbr-rt  peak-rate average-rate burst

Configures the real-time Variable Bit Rate (VBR). (Cisco MC3810 and Multiport T1/E1 ATM Network Module only.)

Enabling Inverse ARP

Inverse ARP is enabled by default when you create a PVC using the pvc command. Once configured, a protocol mapping between an ATM PVC and a network address is learned dynamically as a result of the exchange of ATM Inverse ARP packets.

Inverse ARP is supported on PVCs running IP or IPX and no static map is configured. If a static map is configured, Inverse ARP will be disabled.

When PVC discovery is enabled on an active PVC and the router terminates that PVC, the PVC will generate an ATM Inverse ARP request. This allows the PVC to resolve its own network addresses without configuring a static map.

Address mappings learned through Inverse ARP are aged out. However, mappings are refreshed periodically. This period is configurable using the inarp command, which has a default of 15 minutes.

You can also enable Inverse ARP using the protocol command. This is necessary only if you disabled Inverse ARP using the no protocol command. For more information about this command, refer to the "ATM Commands" chapter in the Cisco IOS Asynchronous Transfer Mode Command Reference.

For an example of configuring Inverse ARP, see the section "Example Enabling Inverse ARP at the end of this chapter.

To enable Inverse ARP on an ATM PVC, use the following commands beginning in global configuration mode:

Procedure
  Command or Action Purpose

Step 1

interface atm slot/ subslot/ port.subinterface {multipoint | point-to-point }

Example:
Router(config)# interface atm  0/ 5/ 0.1/1/1/1.1  {multipoint | point-to-point }

Specifies the ATM interface using the appropriate format of the interface atm command.1

Step 2

pvc [name ] vpi / vci

Specifies an ATM PVC by name (optional) and VPI/VCI numbers.

Step 3

encapsulation aal5snap

Configures AAL5 LLC-SNAP encapsulation if it is not already configured.

Step 4

inarp minutes

(Optional) Adjusts the Inverse ARP time period.

1 To determine the correct form of the interface atm command, consult your ATM network module, port adapter, or router documentation.

Configuring Broadcast on a PVC

To send duplicate broadcast packets for all protocols configured on a PVC, use the following command in interface-ATM-VC configuration mode:


Note

If you enable or disable broadcasting directly on a PVC using the protocol command, this configuration will take precedence over any direct configuration using the broadcast command.

Command

Purpose 


Router(config-if-atm-vc)# broadcast

Sends duplicate broadcast packets for all protocols configured on a PVC.

Configuring a PVC on a Multipoint Subinterface

Creating a multipoint subinterface allows you to create a point-to-multipoint PVC that can be used as a broadcast PVC for all multicast requests. To create a PVC on a multipoint subinterface, use the following procedure beginning in global configuration mode:

Procedure
  Command or Action Purpose

Step 1

Router(config)# interface atm slot/ subslot/ port. subinterface multipoint

Creates the specified point-to-multipoint subinterface on the given port on the specified ATM SPA, and enters subinterface configuration mode, where:

  • slot —Specifies the chassis slot number where the SIP is installed.

  • subslot —Specifies the secondary slot of the SIP where the SPA is installed.

  • port —Specifies the number of the individual interface port on a SPA.

  • subinterface —Specifies the number of the subinterface.

Step 2

Router(config-subif)# ip address address mask

Assigns the specified IP address and subnet mask to this subinterface.

Step 3

Router(config-subif)# no ip directed-broadcast

(Optional) Disables the forwarding of IP directed broadcasts, which are sometimes used in denial of service (DOS) attacks.

Step 4

Router(config-subif)# pvc [name ] vpi /vci

Configures a new ATM PVC by assigning its VPI/VCI numbers and enters ATM VC configuration mode. The valid values for vpi /vci are:

  • name —(Optional) An arbitrary string that identifies this PVC.

  • vpi —Specifies the VPI ID. The valid range is 0 to 255.

  • vci —Specifies the VCI ID. The valid range is 32 to 65535. Values 1 to 31 are reserved and should not be used, except for 5 for the QSAAL PVC and 16 for the ILMI PVC. ILMI is not supported on the Cisco ASR 920 Series Routers.

Note 

When using the pvc command, remember that the vpi /vci combination forms a unique identifier for the interface and all of its subinterfaces. If you specify a vpi /vci combination that has been used on another subinterface, the Cisco IOS XE software assumes that you want to modify that PVC’s configuration and automatically switches to its parent subinterface.

Step 5

Router(config-if-atm-vc)# protocol protocol {protocol-address | inarp } broadcast

Configures the PVC for a particular protocol and maps it to a specific protocol-address .

  • protocol —Typically set to ip or pppoe , but other values are possible.
    Note 

    PPP is not supported on the Cisco ASR 920 Series Routers

  • protocol-address —Destination address or virtual template interface for this PVC (if appropriate for the protocol ).

  • inarp —Specifies that the PVC uses Inverse ARP to determine its address.

  • broadcast — Specifies that this mapping should be used for multicast packets.

Step 6

Router(config-if-atm-vc)# inarp minutes

(Optional) If using Inverse ARP, configures how often the PVC transmits Inverse ARP requests to confirm its address mapping. The valid range is 1 to 60 minutes, with a default of 15 minutes.

Step 7

Router(config-if-atm-vc)# encapsulation {aal0 | aal5 | aal5snap }

(Optional) Configures the ATM adaptation layer (AAL) and encapsulation type.

Note 

Repeat Step 1 through Step 7 for each multipoint subinterface to be configured on this ATM SPA.

Step 8

Router(config-if-atm-vc)# end

Exits interface configuration mode and returns to privileged EXEC mode.

Customizing the ATM Interface

You can customize the ATM interface. The features you can customize have default values that will most likely suit your environment and probably need not be changed. However, you might need to enter configuration commands, depending upon the requirements for your system configuration and the protocols you plan to route on the interface.

Configuring MTU Size

Each interface has a default maximum packet size or maximum transmission unit (MTU) size. For ATM interfaces, this number defaults to 4470 bytes.

To set the maximum MTU size, use the following command in interface configuration mode:

Command

Purpose 


Router(config-subif)# mtu  bytes

Sets the maximum MTU size on the subinterface.

Note 
The MTU size can be changed for an ATM Layer 3 subinterface only.

How to Configure Clear Channel ATM

This section explains how to configure clear channel ATM on an OC-3 IM.

Configuring Clear Channel ATM on OC-3 IM with SONET Framing

To configure ATM on an OC-3 IM with SONET framing, perform these steps:

Procedure

  Command or Action Purpose

Step 1

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 2

controller sonet slot/ subslot/ port

Example:

Router(config)#controller sonet 0/1/0
Enters controller configuration mode to configure SONET.

  • slot/subslot/port—Specifies the location of the controller.

    For OC-3, valid ports are from 0 to 3.

Step 3

framing sonet

Example:

Router(config-controller)# framing sonet

Specifies the framing type as SONET.

Step 4

sts-1 sts-identifier atm

Example:

Router(config-controller)# sts-1 1 - 3 atm
Configures Synchronous Transport Signal (STS) (level)-1 in the SONET hierarchy.

  • sts-1— Specifies the SONET STS level.

  • sts-identifier—For OC-3, valid sts-identifier is from 1 to 3.

  • atm—Specifies clear channel ATM mode for STS.

Step 5

interface ATM slot/ subslot/ port:sts-1-num

Example:

(for main interface) 
Router(config-controller)# interface ATM 0/1/0:1
(for sub-interface) 
Router(config-controller)# interface ATM 0/1/0:1.1 point-to-point
Enters clear channel ATM mode.

  • slot/subslot/port:sts-1-num—Specifies the location of the clear channel ATM.

Step 6

pvc vpi/ vci l2transport

Example:

Router(config-subif)#pvc 10/100 l2transport

Assigns a virtual path identifier (VPI) and virtual channel identifier (VCI).

  • vpi/vci—Specifies VPI and VCI.

  • l2transport—Specifies that the PVC is a switched PVC instead of a terminated PVC.

Step 7

encapsulation aal5

Example:

Router(cfg-if-atm-l2trans-pvc)#encapsulation aal5

Sets the PVC encapsulation type to AAL5.

Step 8

xconnect remote-ip-address vc-id encapsulation mpls

Example:

Router(cfg-if-atm-l2trans-pvc)#xconnect 10.1.1.101 100 encapsulation mpls

Binds the attachment circuit to the ATM interface to create a pseudowire.

Configuring Clear Channel ATM in OC-3 Mode with SDH Framing

To configure clear channel ATM in OC-3 mode with SDH framing, perform these steps:

Procedure

  Command or Action Purpose

Step 1

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 2

controller sonet slot/ subslot/ port

Example:

Router(config)#controller sonet 0/1/0
Enters controller configuration mode to configure SDH.

  • slot/subslot/port—Specifies the location of the controller.

    For OC-3, valid ports are from 0 to 3.

Step 3

framing sdh

Example:

Router(config-controller)#framing sdh

Specifies the framing type as SDH.

Step 4

aug mapping au-4

Example:

Router(config-controller)#aug mapping au-4

Configures the AUG to be derived from AU-4.

Step 5

au-4 au-4-number atm

Example:

Router(config-controller)#au-4 1 atm

Specifies the Administrative Unit type 4 (AU-4) numbers and enters clear channel ATM mode.

Step 6

interface ATM slot/ subslot/ port:au-4-num. subint point-to-point

Example:

Router(config-controller)# interface ATM ATM0/1/0:1.1 point-to-point

Specifies the ATM interface as the point-to-point interface type.

Step 7

pvc vpi/ vci l2transport

Example:

Router(config-subif)#pvc 10/100 l2transport

Assigns a virtual path identifier (VPI) and virtual channel identifier (VCI).

  • vpi/vci—Specifies VPI and VCI.

  • l2transport—Specifies that the PVC is a switched PVC instead of a terminated PVC.

Step 8

encapsulation aal5

Example:

Router(cfg-if-atm-l2trans-pvc)#encapsulation aal5

Sets the PVC encapsulation type to AAL5.

Step 9

xconnect remote-ip-address vc-id encapsulation mpls

Example:

Router(cfg-if-atm-l2trans-pvc)#xconnect 10.1.1.101 100 encapsulation mpls

Binds the attachment circuit to the ATM interface to create a pseudowire.

ATM Configuration Examples

The examples in the following sections illustrate how to configure ATM for the features described in this chapter. The examples below are presented in the same order as the corresponding configuration task sections:

Example: Configuring Supported ATM Interface Types

The following example shows how to configure main ATM interface: 


enable
configure terminal
 interface atm 0/0/0
 no shutdown

Example Creating a PVC

The following example shows how to create a PVC on an ATM main interface with AAL5 encapsulation configured and a VBR-NRT QOS specified. For further information, refer to the sections Creating a PVC and Configuring PVC Traffic Parameters earlier in this chapter. 


interface 0/5/0.1/1/1/1 point-to-point
 pvc 1/40
 encapsulation aal5
 vbr-nrt 100000 50000 20vbr-nrt 1000 500 50
 exit

PVCs in a Fully Meshed Network Example

The figure below illustrates a fully meshed network. The configurations for routers A, B, and C follow the figure. In this example, the routers are configured to use PVCs. Fully meshed indicates that any workstation can communicate with any other workstation. Note that the two protocol statements configured in router A identify the ATM addresses of routers B and C. The two protocol statements in router B identify the ATM addresses of routers A and C. The two protocol statements in router C identify the ATM addresses of routers A and B. For further information, refer to the sections “Creating a PVC” and “Mapping a Protocol Address to a PVC”.

Figure 1. Fully Meshed ATM Configuration Example

Router A


ip routing
!
interface atm 0/5/0.1/1/1/1
 ip address 131.108.168.1 255.255.255.0
 pvc 0/32
 protocol ip 131.108.168.2 broadcast
 exit
!
 pvc 0/33
 protocol ip 131.108.168.3 broadcast
 exit

Router B


ip routing
!
interface atm 0/5/0.1/1/1/1.1
 ip address 131.108.168.2 255.255.255.0
 pvc 0/32
 protocol ip 131.108.168.1 broadcast
 exit
!
 pvc 0/34
 protocol ip 131.108.168.3 broadcast
 exit

Router C


ip routing
!
interface atm 0/5/0.1/1/1/1.1
 ip address 131.108.168.3 255.255.255.0
 pvc 0/33 
 protocol ip 131.108.168.1 broadcast
 exit
!
 pvc 0/34
 protocol ip 131.108.168.2 broadcast
 exit

Enabling Inverse ARP Example

The following example shows how to enable Inverse ARP on an ATM interface and specifies an Inverse ARP time period of 10 minutes. For further information, refer to the section Enabling Inverse ARP. 


interface atm 2/0/0.1
 pvc 1/32
 inarp 10
 exit

PVC on a Point-to-Point Subinterface Configuration Example 

interface ATM 0/0/0.9 point-to-point
mtu 4470
bandwidth 34000
ip vrf forwarding vrfexample
ip address 192.0.2.1 255.255.255.0
ip mtu 4470
pvc 11/105
ubr 38
oam-pvc manage
encapsulation aal5snap
!
interface ATM 0/0/0.11 point-to-point
mtu 4470
bandwidth 7000
ip address 192.0.2.2 255.255.255.0
ip mtu 4470
pvc 100/50
cbr 7000
encapsulation aal5snap
max-reserved-bandwidth 100

Monitoring and Maintaining the ATM Interface

After configuring an ATM interface, you can display its status. You can also display the current state of the ATM network and connected virtual circuits. To show current virtual circuits and traffic information, use the following commands in EXEC mode:

Command

Purpose 


Router# show arp

Displays entries in the ARP table. 


Router# show atm class-links  {vpi  /  vci  | name }

Displays PVC parameter configurations and where the parameter values are inherited from. 


Router# show atm interface atm  slot  /0 

Router# show atm interface atm  slot  /  port-adapter  /0 

Router# show atm interface atm  number

Displays ATM-specific information about the ATM interface using the appropriate format of the show atm interface atm command.2 


Router# show atm map

Displays the list of all configured ATM static maps to remote hosts on an ATM network. 


Router# show atm pvc  [vpi  /  vci  | name  | interface atm  interface_number ]

Displays all active ATM PVCs and traffic information. 


Router# show atm traffic

Displays global traffic information to and from all ATM networks connected to the router and a list of counters of all ATM traffic on this router. 


Router# show atm  vc  [vcd-number  | [range  lower-limit-vcd upper-limit-vcd ] [interface ATM  interface-number ]
 [detail  [prefix  {vpi/vci  | vcd  | interface  | vc_name }]] [connection-name ] | signalling  [freed-svcs  |
 [cast-type  {p2mp  | p2p }] [detail ] [interface ATM  interface-number ]] | summary ATM  interface-number ]

Displays all active ATM virtual circuits (PVCs ) and traffic information.

Note 

The SVCs and the signalling keyword are not supported on the Cisco ASR 920 series routers. 


Router# show interfaces atm controller. port-channels. subinterface

Displays statistics for the ATM interface using the appropriate format of the show interfaces atm command. 


Router# show network-clocks 
 synchronization

Displays the clock signal sources and priorities that you established on the router.

2 To determine the correct form of the interface atm command, consult your ATM network module, port adapter, or router documentation.

Additional References

Related Documents

Related Topic

Document Title

ATM commands

Cisco IOS Asynchronous Transfer Mode Command Reference

Standards

Standard

Title

No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature.

--

MIBs

MIB

MIBs Link

  • Cisco PVC trap MIB - CISCO-IETF-ATM2-PVCTRAP-MIB

To locate and download MIBs for selected platforms, Cisco IOS XE software releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs

RFCs

RFC

Title

No new or modified RFCs are supported by this feature, and support for existing RFCs has not been modified by this feature.

--

Technical Assistance

Description

Link

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Access to most tools on the Cisco Support website requires a Cisco.com user ID and password.

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